PLACE patties and foil packet on grill rack over medium heat. Grill for 10 to 13 minutes or until patties are cooked through and bell peppers are tender, turning patties and foil packet once halfway through grilling. Meanwhile, heat remaining marinara sauce.

PLACE burgers on bottom of rolls; top with bell peppers and cheese. Spoon some of the marinara sauce over the burgers. Top with tops of rolls. Serve with any remaining marinara sauce.